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Bini, I am so confused by the Power Button definition in ACPI Spec which shown as below,please give me a hand,thanks!
$ n/ y- b2 {6 n* M8 zIn legacy systems, the power button typically either forces the machine into Soft Off or Mechanical Off or, on a laptop, forces it to some sleeping state. No allowance is made for user policy (such as the user wants the machine to “come on” in less than 1 second with all context as it was when the user turned the machine “off”), system alert functions (such as the system being used as an answering machine or fax machine), or application function (such as saving a user file).- V$ a6 S5 t) `( n; J% B. }' G) L( B
In an OSPM system, there are two switches. One is to transition the system to the Mechanical Off state. A mechanism to stop current flow is required for legal reasons in some jurisdictions (for example, in some European countries). The other is the “main” power button. This is in some obvious place (for example, beside the keyboard on a laptop). Unlike legacy on/off buttons, all it does is send a request to the system. What the system does with this request depends on policy issues derived from user preferences, user function requests, and application data. |
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发表于 2008-9-25 15:04:29
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